Electrical problems can be caused by corrosion, pests and car accidents. These problems usually necessitate wiring repairs. Here, Michael is repairing the ground for the driver’s door control module in a Mercedes-Benz CL500. All of the wires are grounded behind the carpet against the firewall which is where he is attaching the new wire in this car, which is standard in not just Mercedes-Benz. You can also see he is covering the wires with heat shrink. In some cases wires are soldered together, completing the circuit. In cases where the wires can’t be held in place to be soldered connectors are used and heat shrink is used to protect the wires from moisture, dust and dirt. Whenever you are in an acident, whether you have a Mercedes-Benz, Audi or BMW or any other make, make sure that the wiring is checked!